Machine for grinding slabs.



P. RICHTER.

MACHINE POR GRINDING SLABS.

APPLIoATIoN FILED JULY ze, 1913.

1,088,297. v Patented Feb. 24, 1914 Mayen or 2ML/@M A e @M PAUL RICHTER, G15'y CHEMNITZ, GrlEllRlVIAITY.I

MACHINE FOR GRINDING sLAis.

Specification of Letters Patent.

Application filed .Tuly 28, 1913. Serial N o. 781,637.

To all 'whom it 'may Concern Be itknown that LPAUL RIoI-rrnn, a subject of the German Emperor, and resident of Dittersdorferstrasse 81, Chemnitz, Germany, have invented certain new and useful Improvements in Machines forl Grinding Slabs, of which the following is a specification.

Myinvention relates to improvements 1n grinding machines for slabs of natural and artificial stone and its object is to provide an arrangement for the continuous introduction of separate slabs to the grinding mechanism.

According to this invention various devices for set-ting and lifting the raw slabs and for removing the finished slabs are arrange'd in such a manner that a single lift- .ing and lowering device serves` successively in several apertures of the turnable worktable for pressing the superposed workpiece against an upper grinding disk. With this arrangement it is now possible to introduce slabs in uninterrupted succession to the circulating grinding disk, to remove the ground slabs and to regulate .the pressure at will, while at the same time little attendance required and the output is great.

The invention is shown in the several ligures of the accompanying drawings, in Whichj Figure 1 is a side elevation, partly in section, of the machine. taken on the line 1 1 of Fig. l. Fig. 3 is a vertical section drawn to a larger scale of the grinder. Fig. 4 is a face view of the upper part of the machine according to Fig. 1. Y

rotates by means of a bevel w ieel 2 the'vertical shaft 3 which carries at its lower screwthreaded end 4 a bearing block 5 in the swinging vnave of which is mounted the planet-wheel 7 for driving the grinding disk 12. The stationary wheel 8, with which the plaai'et-\vlieel engages, is mounted with a long sleeve in the lower arm of the frame and is prevented from turning by a-slot and screw engagement l0 and 11 respectively.

The planet motion of the grinding disk 12 insures for a uniform and smooth surface being obtained over the entire slab. The

grinding disk 12 is fixed to an iron plate 13 which connects it with v the carrier 14. The

carrier 14 has an open upwardly directed flange 15 into which a constant stream of Fig. 2 is a section' The bevel wheel 1 on the. dlivingv shaft 11' sis'ts in a spindle 17, operated by the handwheel 18 (Figs. l and 4), coiled spring 19 and a screw nut 20 forfregulating. the ten sion lof the spring 19 when the shaft 3 is shifted. The long sleeve of the stationary wheel 8 in which the shaft 3 is mounted, moves down with the latter and its wheel I8 by reason of plate 21 fast on the planetwheel i, see Fig. 3'.

The round table 22, which turns on a central pivot in ball-bearing and upon a lower ball 23, and which can be easily turned by means of handles 24, is here. shown byv way of example with four openings 25 which forni passages for a slightly smaller lifting plate 2Gl provided with four pins 27 for carrying the workpiece and pressing same against the grinding disk 12. The lifting plate 26 is operated by al handlever 32 which at 31 is pivotally connected to the vertical stenr 30 of the plate 2G. The table 22 is locked during the grinding operation by a bolt 38 entering one( of the notches 39.

To prevent the slabs, loosely supported upon the pins 27 of the plate 26, from lateral displacement during the grinding process the table hasslots 28 near each side of the openings 25 in which four guards A29 can be adjusted and fixed so as to hold the workpiece. The two-armed` hand-lever 32 carries at its forward end la Weight 33 the shifting of which will regulate the pressure of the workpiece against the grinding disk. For turning the t-able 22 after a slab has been finished, the weighted lever 32 is to be lifted until a spring-actuated bolt 34 slabs into a notch 35 and thereby keeps said lever up and the lifting plate 2G lowered. A rod 3G is then pulled so as to withdraw, through the intervention of a double lever 37, thc locking bolt 38 from the notch 39 and` allow the table to be turned by means of one of the handles 24 until the next notch 39 engagcswith the locking bolt 38. The spring 40 then keeps t-he table automatically locked. Below the table underneath the grinding appliance there is provided a water collecting bowl 41 with outlet pipe 42 for the discharge of Waste water. In consequence of Patented Feb.l 24, 1914.

the multi-supporting places Jfor the slabs uponA the table, according to this arrangement, continuous working can beA carried out, that is to say that while one 'slab` is being ground a previously finished slab `can be removed' at one side of the machine and a fresh slab for grinding can be placed on the table at the other side thereof.

What I claim as my invention and desire to secure by Letters Patent is 1. Machinefor grinding slabs, compris ing in combination a machine-frame, a table formed @with circularlydisposed apertures and turnable in said frame, a grinding disk arranged in said frame, means for turning said` grinding disk, a plate for holding the workpiece and adapted to traverse any of said apertures, adjustable guard rails surrounding the apertures in-said table and adapted to prevent the lworkpiece from lateral displacement and means `for vertically moving said plate, substantially as and for the purpose set forth.

2. Machine for grinding slabs, comprising in combination a machine-frame, a table formed wit-h circularly disposed apertures and turnable in said frame, a grinding disk arranged in said frame, means for turning said grinding disk, a plate for holding the workpiece and adapted to traverse any of said apertures, guard rails adjustable in slots and surrounding the Aapertures in said table and adapted to prevent' the workpiece from lateral displacement, a stem vertically guided in said machine frame and carrying said plate, a hand-lever for vmoving said stem,a spring actuated bolt for-holding said hand lever in its uppermost position, a locking bolt engaging into notches provided in the rim of said table, and lever-connection to withdraw said bolt from said notches, substantially as set forth.

In testimony whereof I have hereunto signed my name this 9th day of July, 19.13, in the presence of two subscribing witnesses.

PAUL RICHTER. Witnesses EMIL GEYER, VALTER HoEiILnR. 

